S.C. Code Ann. § 20-1-270: Proof of age required of applicant over age eighteen and under age twenty-five.

All persons over eighteen years of age and under twenty-five years of age shall furnish documentary evidence to the probate judge or any other officer authorized under the law to issue marriage licenses which shall prove the age of the applicant to the satisfaction of such probate judge or other officer. The probate judge or other officer shall enter upon the record of the application a brief description of evidence submitted.